﻿//
// (C) Copyright 2009 Irantha Suwandarathna (iranthas@hotmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#if !SILVERLIGHT && !PLATFORM_COMPACTFRAMEWORK
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.IO.Compression;
using EffiProz.Core.Lib;
using EffiProz.Core.Persist;
using EffiProz.Core.RowIO;

namespace EffiProz.Core.ScriptIO
{
    public class ScriptReaderDecode : ScriptReaderText
    {
        Stream dataInput;
        Crypto crypto;
        byte[] buffer = new byte[256];
        Stream cStream;

        public ScriptReaderDecode(Database db, String fileName,
                                  Crypto crypto)
            : base(db)
        {

            Stream stream =
                database.logger.getFileAccess().OpenInputStreamElement(fileName);
            cStream = stream = crypto.getInputStream(stream);

            stream = new GZipStream(cStream, CompressionMode.Decompress);
            dataStreamIn = new StreamReader(stream);
            rowIn = new RowInputTextLog();
        }

        public ScriptReaderDecode(Database db, String fileName, Crypto crypto,
                                  bool forLog)
            : base(db)
        {

            this.crypto = crypto;

            Stream d =
                database.logger.getFileAccess().OpenInputStreamElement(fileName);

            dataInput = new BufferedStream(d);
            rowIn = new RowInputTextLog();
        }

        public override bool readLoggedStatement(Session session)
        {

            if (dataInput == null)
            {
                return base.readLoggedStatement(session);
            }

            BinaryReader reader = new BinaryReader(dataInput);
            int count;

            try
            {
                count = reader.ReadInt32();

                if (count * 2 > buffer.Length)
                {
                    buffer = new byte[count * 2];
                }

                reader.Read(buffer, 0, count);
            }
            catch (Exception )
            {
                return false;
            }

            buffer = crypto.decode(buffer, 0, count);
            count = buffer.Length;

            String s = Encoding.UTF8.GetString(buffer);

            lineCount++;

            //        System.out.println(lineCount);
            statement = StringConverter.unicodeStringToString(s);

            if (statement == null)
            {
                return false;
            }

            processStatement(session);

            return true;
        }

        public override void close()
        {

            try
            {
                if (cStream != null)
                {
                    cStream.Close();
                }

                if (dataStreamIn != null)
                {
                    dataStreamIn.Close();
                }

                if (dataInput != null)
                {
                    dataInput.Close();
                }
            }
            catch (Exception ) { }
        }
    }
}

#endif
